Genetic Evaluation For Some Economically Importance Variables In Friesian Cows
نویسندگان
چکیده
منابع مشابه
Estimates of Genetic and Phenotypic Parameters for Milk Production in Moroccan Holstein-Friesian Cows
To satisfy the growing demand of the human population for milk, the Moroccan government set up a plan in 1975 to increase milk production. The most important genetic strategies were the introduction of improved dairy cattle, the institution of milk recording, and the extension of artificial insemination (AI). Thus, more than 10,000 Holstein and Friesian heifers were purchased annually from Euro...
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The decline of dairy cattle fertility worldwide remains a major concern, with conception rates to first service commonly below 40%. The length and severity of negative energy balance postpartum are unfavorably correlated with fertility, suggesting that the length and severity of negative energy balance and fertility are linked via several hormones or metabolites. These compounds therefore have ...
متن کاملGenetic analysis of lactation persistency in the Polish Holstein-Friesian cows*
The objectives of this study were to analyze the genetic properties of three measures of lactation persistency in Polish Holstein-Friesian cows, and possibly to choose one measure which could be used for estimation of breeding value for lactation persistency in the Polish dairy cattle population. Data included 117,327 first three lactations of 110,141 cows calved in 1995-2009. The lactation cur...
متن کاملGenetic analysis of atypical progesterone profiles in Holstein-Friesian cows from experimental research herds.
The objective of this study was to quantify the genetic variation in normal and atypical progesterone profiles and investigate if this information could be useful in an improved genetic evaluation for fertility for dairy cows. The phenotypes derived from normal profiles included cycle length traits, including commencement of luteal activity (C-LA), interluteal interval, luteal phase length. and...
متن کاملSome Factors Affecting Twinning Rate and Its Effects on Postpartum Reproductive Performance of Friesian Cows
A total number of 1243 records of calving cases of 585 dairy Friesian cows during 8 consecutive years from 1997 to 2004 collected from Sakha Animal Production Research Station belonging to Animal Production Research Institute, Agriculture Research Center were used to study the effect of sire, live body weight (LBW) and age of dam and calving season on twinning rate and its consequent effects on...
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ژورنال
عنوان ژورنال: Journal of Animal and Poultry Production
سال: 2020
ISSN: 2090-3723
DOI: 10.21608/jappmu.2020.95823